CN117567175A - High-water-retention type organosilicon concrete external curing agent and preparation method thereof - Google Patents
High-water-retention type organosilicon concrete external curing agent and preparation method thereof Download PDFInfo
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- CN117567175A CN117567175A CN202311548609.8A CN202311548609A CN117567175A CN 117567175 A CN117567175 A CN 117567175A CN 202311548609 A CN202311548609 A CN 202311548609A CN 117567175 A CN117567175 A CN 117567175A
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- 239000004567 concrete Substances 0.000 title claims abstract description 108
- 206010016807 Fluid retention Diseases 0.000 title claims abstract description 43
- 238000002360 preparation method Methods 0.000 title claims abstract description 30
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 81
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 60
- 238000006460 hydrolysis reaction Methods 0.000 claims abstract description 47
- 230000007062 hydrolysis Effects 0.000 claims abstract description 36
- 239000003054 catalyst Substances 0.000 claims abstract description 31
- 239000002904 solvent Substances 0.000 claims abstract description 27
- 238000003756 stirring Methods 0.000 claims abstract description 25
- YHWCPXVTRSHPNY-UHFFFAOYSA-N butan-1-olate;titanium(4+) Chemical compound [Ti+4].CCCC[O-].CCCC[O-].CCCC[O-].CCCC[O-] YHWCPXVTRSHPNY-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000008367 deionised water Substances 0.000 claims abstract description 24
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 24
- JJQZDUKDJDQPMQ-UHFFFAOYSA-N dimethoxy(dimethyl)silane Chemical compound CO[Si](C)(C)OC JJQZDUKDJDQPMQ-UHFFFAOYSA-N 0.000 claims abstract description 24
- BFXIKLCIZHOAAZ-UHFFFAOYSA-N methyltrimethoxysilane Chemical compound CO[Si](C)(OC)OC BFXIKLCIZHOAAZ-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000006243 chemical reaction Methods 0.000 claims abstract description 22
- BPSIOYPQMFLKFR-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)CCCOCC1CO1 BPSIOYPQMFLKFR-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000002994 raw material Substances 0.000 claims abstract description 18
- 239000000047 product Substances 0.000 claims abstract description 15
- 238000010790 dilution Methods 0.000 claims abstract description 11
- 239000012895 dilution Substances 0.000 claims abstract description 11
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 45
- SWXVUIWOUIDPGS-UHFFFAOYSA-N diacetone alcohol Chemical compound CC(=O)CC(C)(C)O SWXVUIWOUIDPGS-UHFFFAOYSA-N 0.000 claims description 36
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 35
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 24
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 14
- 239000000243 solution Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 12
- 238000010907 mechanical stirring Methods 0.000 claims description 9
- 235000006408 oxalic acid Nutrition 0.000 claims description 8
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 6
- 239000000413 hydrolysate Substances 0.000 claims description 2
- 230000001680 brushing effect Effects 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 6
- 238000005507 spraying Methods 0.000 abstract description 6
- HQYALQRYBUJWDH-UHFFFAOYSA-N trimethoxy(propyl)silane Chemical compound CCC[Si](OC)(OC)OC HQYALQRYBUJWDH-UHFFFAOYSA-N 0.000 abstract description 4
- 239000000853 adhesive Substances 0.000 abstract description 2
- 230000001070 adhesive effect Effects 0.000 abstract description 2
- 230000006378 damage Effects 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 231100000956 nontoxicity Toxicity 0.000 abstract description 2
- 239000012466 permeate Substances 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 13
- 239000000839 emulsion Substances 0.000 description 12
- 238000010521 absorption reaction Methods 0.000 description 8
- 239000002253 acid Substances 0.000 description 8
- 229960000583 acetic acid Drugs 0.000 description 7
- 239000003638 chemical reducing agent Substances 0.000 description 7
- -1 gamma- (2 Chemical compound 0.000 description 7
- 239000004568 cement Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 239000004698 Polyethylene Substances 0.000 description 4
- 239000000654 additive Substances 0.000 description 4
- 230000036571 hydration Effects 0.000 description 4
- 238000006703 hydration reaction Methods 0.000 description 4
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 4
- 229920000573 polyethylene Polymers 0.000 description 4
- 229910000077 silane Inorganic materials 0.000 description 4
- 229910019142 PO4 Inorganic materials 0.000 description 3
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 3
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 239000012975 dibutyltin dilaurate Substances 0.000 description 3
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 3
- 239000010452 phosphate Substances 0.000 description 3
- 239000012744 reinforcing agent Substances 0.000 description 3
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 2
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 2
- 239000006087 Silane Coupling Agent Substances 0.000 description 2
- 239000002518 antifoaming agent Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000003995 emulsifying agent Substances 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- 230000002209 hydrophobic effect Effects 0.000 description 2
- 239000003999 initiator Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 229920005646 polycarboxylate Polymers 0.000 description 2
- 229920000098 polyolefin Polymers 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 239000002562 thickening agent Substances 0.000 description 2
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 2
- RTTZISZSHSCFRH-UHFFFAOYSA-N 1,3-bis(isocyanatomethyl)benzene Chemical compound O=C=NCC1=CC=CC(CN=C=O)=C1 RTTZISZSHSCFRH-UHFFFAOYSA-N 0.000 description 1
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 1
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 1
- ISKQADXMHQSTHK-UHFFFAOYSA-N [4-(aminomethyl)phenyl]methanamine Chemical compound NCC1=CC=C(CN)C=C1 ISKQADXMHQSTHK-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229920013822 aminosilicone Polymers 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000007822 coupling agent Substances 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- HOOWDPSAHIOHCC-UHFFFAOYSA-N dialuminum tricalcium oxygen(2-) Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[Al+3].[Al+3].[Ca++].[Ca++].[Ca++] HOOWDPSAHIOHCC-UHFFFAOYSA-N 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- YGUFXEJWPRRAEK-UHFFFAOYSA-N dodecyl(triethoxy)silane Chemical compound CCCCCCCCCCCC[Si](OCC)(OCC)OCC YGUFXEJWPRRAEK-UHFFFAOYSA-N 0.000 description 1
- FWDBOZPQNFPOLF-UHFFFAOYSA-N ethenyl(triethoxy)silane Chemical compound CCO[Si](OCC)(OCC)C=C FWDBOZPQNFPOLF-UHFFFAOYSA-N 0.000 description 1
- 229910001653 ettringite Inorganic materials 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000012362 glacial acetic acid Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- MSRJTTSHWYDFIU-UHFFFAOYSA-N octyltriethoxysilane Chemical compound CCCCCCCC[Si](OCC)(OCC)OCC MSRJTTSHWYDFIU-UHFFFAOYSA-N 0.000 description 1
- 229960003493 octyltriethoxysilane Drugs 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000002940 repellent Effects 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- SCPYDCQAZCOKTP-UHFFFAOYSA-N silanol Chemical compound [SiH3]O SCPYDCQAZCOKTP-UHFFFAOYSA-N 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- KSBAEPSJVUENNK-UHFFFAOYSA-L tin(ii) 2-ethylhexanoate Chemical compound [Sn+2].CCCCC(CC)C([O-])=O.CCCCC(CC)C([O-])=O KSBAEPSJVUENNK-UHFFFAOYSA-L 0.000 description 1
- CPUDPFPXCZDNGI-UHFFFAOYSA-N triethoxy(methyl)silane Chemical compound CCO[Si](C)(OCC)OCC CPUDPFPXCZDNGI-UHFFFAOYSA-N 0.000 description 1
- NBXZNTLFQLUFES-UHFFFAOYSA-N triethoxy(propyl)silane Chemical compound CCC[Si](OCC)(OCC)OCC NBXZNTLFQLUFES-UHFFFAOYSA-N 0.000 description 1
- AAPLIUHOKVUFCC-UHFFFAOYSA-N trimethylsilanol Chemical compound C[Si](C)(C)O AAPLIUHOKVUFCC-UHFFFAOYSA-N 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
- 239000012856 weighed raw material Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/04—Preventing evaporation of the mixing water
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
An external curing agent of high-water-retention organosilicon concrete and a preparation method thereof are provided, wherein the external curing agent is prepared from the following raw materials: methyltrimethoxysilane, dimethyldimethoxysilane, gamma- (2, 3-epoxypropoxy) propyltrimethoxysilane, tetrabutyl titanate, a solvent, deionized water and a hydrolysis catalyst. The preparation method comprises the following steps: adding methyltrimethoxysilane, dimethyldimethoxysilane, gamma- (2, 3-glycidoxy) propyltrimethoxysilane, a hydrolysis catalyst and deionized water into a reaction kettle, and starting stirring to perform hydrolysis reaction to obtain a hydrolysis product; adding solvent into the reaction kettle for dilution, stirring, adding tetrabutyl titanate, and stirring. The external curing agent can ensure that concrete is fully hydrated under the condition of primary spraying or brushing in the early stage, has the waterproof and impervious effects in the later stage, can effectively permeate the surface of the concrete and solidify to block capillary holes of the filled concrete, and has the advantages of strong adhesive force, good weather resistance, no toxicity, no harm and environmental friendliness.
Description
Technical Field
The invention relates to a concrete external curing agent, in particular to a high-water-retention organic silicon concrete external curing agent, and belongs to the technical field of building material chemical additives. The invention also relates to a preparation method of the concrete external curing agent, in particular to a preparation method of the high-water-retention type organosilicon concrete external curing agent.
Background
Building safety is always the focus of social attention, along with the rapid development of domestic real estate and engineering project construction progress, the requirements of people on the safety and reliability of the building are gradually improved, cement concrete is always the most important structural material of the building engineering since the advent of the cement concrete, and the performances such as strength, durability and the like of the concrete directly influence the quality of the building. The volume shrinkage deformation can occur in the hydration hardening process of the concrete, and meanwhile, the tensile stress in the concrete is larger than the tensile strength, cracking and water seepage phenomena occur, so that the durability of the concrete, the stability of the reinforcing steel bars and the safety of the building are seriously affected. In order to prevent the cracking and water seepage of concrete, the waterproof agent and the silane impregnant have obvious effects, and the waterproof agent is provided with colloid forming or other components for blocking and filling capillary holes, and the components remain in the capillary holes after the cement concrete is hardened, so that the capillary hole road is cut off to achieve the aim of waterproof; the silane impregnant has small molecular structure capable of penetrating through the cementing surface, penetrating into the concrete, and chemically reacting with air exposed in acid or alkali environment and water molecules in the substrate to form a water repellent treatment layer, so as to inhibit water from entering the substrate. In addition, for fresh concrete, the full curing is a decisive factor for ensuring the strength and better impermeability of the concrete, and the concrete curing is favorable for full hydration of cement so as to reduce the porosity of the concrete and cut the continuity of capillary holes, and has the practice evidence that the impermeability of the concrete can be greatly improved after the concrete is cured for 14 days. Before the final setting of the freshly mixed concrete, the internal moisture content of the freshly mixed concrete is sufficient and is not sufficient for ensuring that the cement is fully hydrated, so that the curing agent is timely coated and cured in the final setting stage of the concrete to prevent the internal moisture from losing, and the hydration degree of the freshly mixed concrete can be effectively ensured, so that the strength of the freshly mixed concrete is ensured. Therefore, the external curing agent for concrete, which can penetrate into capillary holes on the surface of the concrete and form a hydrophobic film layer on the surface of the concrete, can simultaneously achieve the two purposes of curing the concrete and resisting water and seepage, and can effectively prevent and treat a series of potential safety hazards of buildings caused by shrinkage and cracking of the concrete.
Related patent literature: CN111138209a discloses a concrete external curing agent, the raw materials of which comprise modified polyolefin wax emulsion, organic emulsion, silane coupling agent, reinforcing agent and inorganic densification component. The prepared external curing agent for concrete adopts modified polyolefin wax emulsion as a main raw material and contains partial reinforcing agent, and has a certain reinforcing effect by adding the reinforcing agent as a catalyst while retaining water through the film forming effect of the wax emulsion and the organic emulsion so as to accelerate the hydration of the tricalcium aluminate content and the formation of ettringite in the concrete. CN105294161a discloses an unsaturated siloxane-based phosphate emulsion concrete curing agent and a preparation method thereof, wherein the curing agent comprises the following raw materials in percentage by mass: 10 to 55 percent of unsaturated siloxane-based phosphate, 0 to 30 percent of unsaturated acid, 5 to 40 percent of unsaturated acid ester, 5 to 10 percent of emulsifying agent, 0.1 to 0.5 percent of catalyst, 0.1 to 0.5 percent of initiator, 1 to 3 percent of film forming auxiliary agent, 0.1 to 0.5 percent of thickening agent, 1 to 3 percent of leveling agent, 0.01 to 0.3 percent of defoaming agent and the balance of water; the preparation method comprises the following steps: respectively dripping unsaturated siloxane-based phosphate, unsaturated acid ester and initiator into water added with an emulsifying agent and a catalyst at the temperature of 60-90 ℃ within three hours; and adding a film forming additive, a thickening agent, a leveling agent and a defoaming agent into the synthesized polymer emulsion to prepare a curing agent finished product.
The above techniques do not give specific guidance on how to make the concrete external curing agent fully hydrated under the condition of primary spraying or brushing in the early stage, and to play a role of water resistance and impermeability in the later stage, and can effectively penetrate to the surface of the concrete and cure to block up the capillary holes of the filled concrete.
Disclosure of Invention
The invention aims to solve the technical problem of providing the high water-retention type organosilicon concrete external curing agent, which can ensure that concrete is fully hydrated under the condition of primary spraying or brushing in the early stage and has the waterproof and impervious effects in the later stage.
Therefore, another technical problem to be solved by the invention is to provide a preparation method of the high-water-retention type organosilicon concrete external curing agent.
In order to solve the technical problems, the invention adopts the following technical scheme:
the high water-retention type organosilicon concrete external curing agent is prepared from the following raw materials in parts by weight: 50-150 parts of methyltrimethoxysilane, 30-80 parts of dimethyldimethoxysilane, 15-60 parts of gamma- (2, 3-glycidoxy) propyltrimethoxysilane, namely gamma- (2, 3-glycidoxy) propyltrimethoxysilane, 5-10 parts of tetrabutyl titanate, 30-100 parts of solvent, 20-50 parts of deionized water and 1-5 parts of hydrolysis catalyst; the solvent is one or the combination of a plurality of methanol, ethanol, diacetone alcohol and acetone, and the proportion is arbitrary during the combination; the hydrolysis catalyst is one or the combination of acetic acid (namely glacial acetic acid) and oxalic acid, the proportion of the hydrolysis catalyst is arbitrary during the combination, and the hydrolysis catalyst has the double effects of promoting the hydrolysis of the silane coupling agent and improving the stability of silanol.
The preparation method of the high water retention type organosilicon concrete external curing agent comprises the following process steps: (1) according to the mass ratio, methyl trimethoxy silane, dimethyl dimethoxy silane, gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, a hydrolysis catalyst and deionized water are put into a reaction kettle, mechanical stirring is started, the rotating speed is 100-200 r/min, and hydrolysis reaction is carried out for 2-4 hours at normal temperature (25 ℃) to obtain a hydrolysis product; (2) then adding a solvent into a reaction kettle for dilution, stirring for 5-10 minutes, adding tetrabutyl titanate, and stirring for 1-3 hours to obtain a colorless transparent solution, namely the high-water-retention organosilicon concrete external curing agent.
The application method of the high water-retention type organosilicon concrete external curing agent comprises the steps of spraying or brushing the high water-retention type organosilicon concrete external curing agent on the surface of concrete, wherein the dosage (brushing amount) can be 200-220g/m 2 Curing for 1-3 h at normal temperature (25 ℃) to form a transparent and smooth hydrophobic film layer.
Among the above technical schemes, the preferred technical scheme can be: the high water retention type organosilicon concrete external curing agent is prepared from the following raw materials in parts by weight: 100 parts of methyltrimethoxysilane, 50 parts of dimethyldimethoxysilane, 50 parts of gamma- (2, 3-epoxypropoxy) propyltrimethoxysilane, 10 parts of tetrabutyl titanate, 50 parts of a solvent which is a combination of 40 parts of methanol and 10 parts of diacetone alcohol, 25 parts of deionized water and 3 parts of a hydrolysis catalyst which is acetic acid; the preparation method of the high water retention type organosilicon concrete external curing agent comprises the following process steps: (1) according to the mass ratio, methyl trimethoxy silane, dimethyl dimethoxy silane, gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, a hydrolysis catalyst and deionized water are put into a reaction kettle, mechanical stirring is started, the rotating speed is 150r/min, and hydrolysis reaction is carried out for 2 hours at normal temperature, so that a hydrolysis product is obtained; (2) then adding a solvent, namely methanol and diacetone alcohol, into a reaction kettle for dilution, stirring for 5 minutes, adding tetrabutyl titanate, and stirring for 1 hour to obtain a colorless transparent solution, namely the high-water-retention organosilicon concrete external curing agent.
Among the above technical solutions, preferred technical solutions may also be embodiment 2, embodiment 3, and embodiment 4.
The invention provides a high-water-retention organosilicon concrete external curing agent and a preparation method thereof, wherein the external curing agent is prepared from the following raw materials: methyltrimethoxysilane, dimethyldimethoxysilane, gamma- (2, 3-epoxypropoxy) propyltrimethoxysilane, tetrabutyl titanate, a solvent, deionized water and a hydrolysis catalyst. The preparation method comprises the following steps: adding methyltrimethoxysilane, dimethyldimethoxysilane, gamma- (2, 3-glycidoxy) propyltrimethoxysilane, a hydrolysis catalyst and deionized water into a reaction kettle, and starting stirring to perform hydrolysis reaction to obtain a hydrolysis product; adding solvent into the reaction kettle for dilution, stirring, adding tetrabutyl titanate, and stirring. Through a comparative test, the external curing agent can ensure that concrete is fully hydrated and plays a role in water resistance and seepage resistance in the later stage under the condition of primary spraying or brushing in the earlier stage, can effectively permeate to the surface of the concrete and solidify to block capillary holes of the filled concrete, and has the advantages of strong adhesive force, good weather resistance, no toxicity and harm and environmental friendliness. The properties are shown in tables 1, 2 and 3 in the application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to examples. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, based on the embodiments of the invention, which would be apparent to one of ordinary skill in the art without making any inventive effort, are intended to be within the scope of the invention.
Example 1: the high-water-retention organosilicon concrete external curing agent is prepared from the following raw materials in parts by weight: 100 parts of methyltrimethoxysilane, 50 parts of dimethyldimethoxysilane, 50 parts of gamma- (2, 3-epoxypropoxy) propyltrimethoxysilane, 10 parts of tetrabutyl titanate, 50 parts of a solvent which is a combination of 40 parts of methanol and 10 parts of diacetone alcohol, 25 parts of deionized water and 3 parts of a hydrolysis catalyst which is acetic acid; the preparation method of the high water retention type organosilicon concrete external curing agent comprises the following process steps: (1) according to the mass ratio, methyl trimethoxy silane, dimethyl dimethoxy silane, gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, a hydrolysis catalyst and deionized water are put into a reaction kettle, mechanical stirring is started, the rotating speed is 150r/min, and hydrolysis reaction is carried out for 2 hours at normal temperature, so that a hydrolysis product is obtained; (2) then adding a solvent, namely methanol and diacetone alcohol, into a reaction kettle for dilution, stirring for 5 minutes, adding tetrabutyl titanate, and stirring for 1 hour to obtain a colorless transparent solution, namely the high-water-retention organosilicon concrete external curing agent.
Example 2: the high-water-retention organosilicon concrete external curing agent is prepared from the following raw materials in parts by weight: 75 parts of methyltrimethoxysilane, 75 parts of dimethyldimethoxysilane, 25 parts of gamma- (2, 3-epoxypropoxy) propyl trimethoxysilane, 5 parts of tetrabutyl titanate, 50 parts of a solvent which is a combination of 35 parts of ethanol and 15 parts of diacetone alcohol, 25 parts of deionized water and 2 parts of a hydrolysis catalyst which is oxalic acid; the preparation method of the high water retention type organosilicon concrete external curing agent comprises the following process steps: (1) according to the mass ratio, methyl trimethoxy silane, dimethyl dimethoxy silane, gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, a hydrolysis catalyst and deionized water are put into a reaction kettle, mechanical stirring is started, the rotating speed is 200r/min, and hydrolysis reaction is carried out for 3 hours at normal temperature, so that a hydrolysis product is obtained; (2) then adding a solvent, namely ethanol and diacetone alcohol, into a reaction kettle for dilution, stirring for 10 minutes, adding tetrabutyl titanate, and stirring for 2 hours to obtain a colorless transparent solution, namely the high-water-retention organosilicon concrete external curing agent.
Example 3: the high-water-retention organosilicon concrete external curing agent is prepared from the following raw materials in parts by weight: 100 parts of methyltrimethoxysilane, 50 parts of dimethyldimethoxysilane, 25 parts of gamma- (2, 3-epoxypropoxy) propyltrimethoxysilane, 8 parts of tetrabutyl titanate, 70 parts of a solvent which is a combination of 55 parts of methanol and 15 parts of diacetone alcohol, 25 parts of deionized water, and 2.5 parts of a hydrolysis catalyst which is a combination of 1.5 parts of acetic acid and 1 part of oxalic acid. The preparation method of the high water retention type organosilicon concrete external curing agent comprises the following process steps: (1) according to the mass ratio, methyl trimethoxy silane, dimethyl dimethoxy silane, gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, acetic acid, oxalic acid and deionized water are put into a reaction kettle, and the hydrolysis reaction is carried out for 4 hours at normal temperature under the condition that the mechanical stirring is started and the rotating speed is 180r/min, so that a hydrolysate is obtained; (2) then adding a solvent, namely methanol and diacetone alcohol, into a reaction kettle for dilution, stirring for 10 minutes, adding tetrabutyl titanate, and stirring for 3 hours to obtain a colorless transparent solution, namely the high-water-retention organosilicon concrete external curing agent.
Example 4: the high-water-retention organosilicon concrete external curing agent is prepared from the following raw materials in parts by weight: 100 parts of methyltrimethoxysilane, 50 parts of dimethyldimethoxysilane, 25 parts of gamma- (2, 3-epoxypropoxy) propyltrimethoxysilane, 8 parts of tetrabutyl titanate, 50 parts of a solvent which is a combination of 35 parts of methanol and 15 parts of diacetone alcohol, 25 parts of deionized water and 3 parts of a hydrolysis catalyst which is acetic acid. The preparation method of the high water retention type organosilicon concrete external curing agent comprises the following process steps: (1) according to the mass ratio, methyl trimethoxy silane, dimethyl dimethoxy silane, gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, a hydrolysis catalyst and deionized water are put into a reaction kettle, mechanical stirring is started, the rotating speed is 180r/min, and hydrolysis reaction is carried out for 3 hours at normal temperature, so that a hydrolysis product is obtained; (2) then adding a solvent, namely methanol and diacetone alcohol, into a reaction kettle for dilution, stirring for 10 minutes, adding tetrabutyl titanate, and stirring for 3 hours to obtain a colorless transparent solution, namely the high-water-retention organosilicon concrete external curing agent.
The following are comparative tests:
comparative example 1: the preparation method of the concrete external curing agent comprises the following steps: step (1): weighing the raw materials according to the weight percentage; 60% of polyethylene wax emulsion, 30% of pure acrylic emulsion, 0.02% of vinyl triethoxysilane coupling agent, 0.02% of triethanolamine, 3% of sodium silicate and 6.96% of tap water. Step 2: and (5) placing the weighed raw materials into a forced mixer to be uniformly mixed, thus obtaining the concrete external curing agent. The polyethylene wax emulsion is selected from polyethylene wax aqueous emulsion, and the particle size of the polyethylene wax emulsion is 150-200 nm.
Comparative example 2: the reinforced organic-inorganic composite concrete external curing agent prepared in the example 1 in the preparation method of the reinforced organic-inorganic composite concrete external curing agent disclosed by CN112624656A is adopted.
Comparative example 3 (waterproofing product Z-6341): a silane impregnant. The composition is as follows: alkyl alkoxy silane (any one of methyl triethoxy silane, propyl triethoxy silane, octyl triethoxy silane and dodecyl triethoxy silane), alkyl silanol (trimethyl silanol), ethanol and water. Comparative example 3 is a commercially available product.
Comparative example 4 (waterproof product YF-203): and (3) a waterproof agent. The composition is as follows: the catalyst comprises an alkane solvent (n-hexane and cyclohexane, and is selected from n-hexane), amino silicone oil, an organotin catalyst (one or a combination of a plurality of dibutyl tin dilaurate, stannous octoate and dibutyl tin diacetate), and the mixture ratio of the dibutyl tin dilaurate and the dibutyl tin dilaurate is arbitrary during the combination, and m-xylylene isocyanate. Comparative example 4 is a commercially available product.
The concrete external curing agent prepared by the embodiment of the invention and the concrete external curing agent of the comparative example are detected, the performance test is carried out on the prepared concrete curing agent by referring to the traffic industry standard JT/T522-2004 highway engineering concrete curing agent, the slump of the concrete mixture is 40mm plus or minus 10mm according to the standard requirement during the test, the concrete mixing ratio is shown in Table 1, and the coating amount of the concrete surface curing agent (of the invention) is 200g/m 2 . The water absorption of the invention refers to British Standard BS 1881-122:2011Testing concrete, and the specific operation is as follows: three test pieces (100 mm multiplied by 100 mm) of the external curing agent coated with the organosilicon concrete are placed in an oven and dried for 72 hours plus or minus 2 at 105 ℃ plus or minus 5 ℃, then placed in a dryer for cooling for 24 hours plus or minus 0.5 hours, immediately weighed after cooling, and the mass of each test piece is recorded, and each test piece is completely immersed in a water tank of a concrete curing box, wherein the water surface is 25mm plus or minus 5mm higher than the highest point of the test piece. Immersing the test piece in water, removing the test piece from the water at the immersion time of 30mins and 48h, and wipingThe test pieces were weighed and the mass was recorded for each test piece until no free water remaining on the surface was observed. The water absorption calculation formula: water absorption (%) = (post-soak test piece mass (g) -pre-soak test piece mass (g))/pre-soak test piece mass (g).
TABLE 1 concrete mix ratio for external curing agent test
| Volume of | Cement and its preparation method | Fly ash | Sand and sand | Stone | Water and its preparation method | Additive agent |
| 1m 3 | 270 | 70 | 907 | 983 | 155 | 1.0％-1.7％ |
The amount of material (raw material) used per cubic meter of concrete in Table 1 is in Kg. The amount of the additive per cubic meter of concrete is 0.015Kg, namely 15g. The mass ratio of the admixture in the table 1 is that 1000g of the admixture contains 255g of polycarboxylic acid high-performance water reducer, 80g of slow-release water reducer, 1g of air entraining agent, 5g of water retaining agent and 659g of water (the admixture is obtained by uniformly blending and stirring). The polycarboxylic acid high-performance water reducer adopts the polycarboxylic acid water reducer for small slump concrete disclosed in CN107474196A and the polycarboxylic acid water reducer for small slump concrete prepared in the example 1 in the preparation method thereof. The slow-release type high-efficiency polycarboxylate water reducer prepared in the example 1 in the preparation method of the slow-release type high-efficiency polycarboxylate water reducer disclosed in CN104016615A is adopted. The air entraining agent adopts the water-soluble high-efficiency concrete rosin air entraining agent disclosed in CN106082764A and the water-soluble high-efficiency concrete rosin air entraining agent prepared in the embodiment 1 in the preparation method thereof. The water-retaining agent adopts the long-acting concrete water-retaining agent disclosed in CN107383274A and the long-acting concrete water-retaining agent prepared in the example 1 in the preparation method thereof.
TABLE 2 external curing agent Performance index
Table 3 waterproof property water absorption test
| Water absorption at 0.5h (%) | 48h Water absorption (%) | |
| Benchmark test piece | 2％ | 4.8％ |
| Example 1 | 0.15％ | 0.3％ |
| Example 2 | 0.2％ | 0.4％ |
| Example 3 | 0.2％ | 0.35％ |
| Example 4 | 0.18％ | 0.4％ |
| Comparative example 3 | 0.15％ | 0.2％ |
| Comparative example 4 | 0.45％ | 2.58％ |
From the test data, the effective water retention, 28d compressive strength ratio of the present invention (examples 1 to 4) was significantly better than that of comparative examples 1, 2. In addition, the water absorption rate of 0.5h of the invention can reach the waterproof product of comparative example 3, and the water absorption rate of 48h also reaches higher level (good performance), so that various diseases caused by water seepage of the base material can be effectively prevented, and the service life of the building is prolonged.
In summary, the invention provides the high water retention type organosilicon concrete external curing agent, which can ensure that concrete is fully hydrated and has waterproof and impervious effects in the later stage under the condition of primary spraying or brushing in the earlier stage.
Claims (6)
1. The high water-retention type organosilicon concrete external curing agent is characterized by being prepared from the following raw materials in parts by weight: 50-150 parts of methyltrimethoxysilane, 30-80 parts of dimethyldimethoxysilane, 15-60 parts of gamma- (2, 3-epoxypropoxy) propyltrimethoxysilane, 5-10 parts of tetrabutyl titanate, 30-100 parts of solvent, 20-50 parts of deionized water and 1-5 parts of hydrolysis catalyst; the solvent is one or the combination of a plurality of methanol, ethanol, diacetone alcohol and acetone, and the proportion is arbitrary during the combination; the hydrolysis catalyst is one or the combination of two of acetic acid and oxalic acid, and the proportion is arbitrary during the combination.
2. The high water retention type organosilicon concrete external curing agent according to claim 1, which is characterized by being prepared from the following raw materials in parts by weight: 100 parts of methyltrimethoxysilane, 50 parts of dimethyldimethoxysilane, 50 parts of gamma- (2, 3-epoxypropoxy) propyltrimethoxysilane, 10 parts of tetrabutyl titanate, 50 parts of a solvent which is a combination of 40 parts of methanol and 10 parts of diacetone alcohol, 25 parts of deionized water and 3 parts of a hydrolysis catalyst which is acetic acid.
3. The high water retention type organosilicon concrete external curing agent according to claim 1, which is characterized by being prepared from the following raw materials in parts by weight: 75 parts of methyltrimethoxysilane, 75 parts of dimethyldimethoxysilane, 25 parts of gamma- (2, 3-epoxypropoxy) propyl trimethoxysilane, 5 parts of tetrabutyl titanate, 50 parts of a solvent which is a combination of 35 parts of ethanol and 15 parts of diacetone alcohol, 25 parts of deionized water and 2 parts of a hydrolysis catalyst which is oxalic acid.
4. The preparation method of the high water retention type organosilicon concrete external curing agent according to claim 1, which is characterized by comprising the following process steps: (1) according to the mass ratio, methyl trimethoxy silane, dimethyl dimethoxy silane, gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, a hydrolysis catalyst and deionized water are put into a reaction kettle, mechanical stirring is started, the rotating speed is 100-200 r/min, and hydrolysis reaction is carried out for 2-4 hours at normal temperature, so that a hydrolysis product is obtained; (2) then adding a solvent into a reaction kettle for dilution, stirring for 5-10 minutes, adding tetrabutyl titanate, and stirring for 1-3 hours to obtain a colorless transparent solution, namely the high-water-retention organosilicon concrete external curing agent.
5. The preparation method of the high-water-retention type organosilicon concrete external curing agent according to claim 4, which is characterized in that the high-water-retention type organosilicon concrete external curing agent is prepared from the following raw materials in parts by weight: 100 parts of methyltrimethoxysilane, 50 parts of dimethyldimethoxysilane, 25 parts of gamma- (2, 3-epoxypropoxy) propyltrimethoxysilane, 8 parts of tetrabutyl titanate, 70 parts of a solvent which is a combination of 55 parts of methanol and 15 parts of diacetone alcohol, 25 parts of deionized water, and 2.5 parts of a hydrolysis catalyst which is a combination of 1.5 parts of acetic acid and 1 part of oxalic acid;
the preparation method of the high water retention type organosilicon concrete external curing agent comprises the following process steps: (1) according to the mass ratio, methyl trimethoxy silane, dimethyl dimethoxy silane, gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, acetic acid, oxalic acid and deionized water are put into a reaction kettle, and the hydrolysis reaction is carried out for 4 hours at normal temperature under the condition that the mechanical stirring is started and the rotating speed is 180r/min, so that a hydrolysate is obtained; (2) then adding a solvent, namely methanol and diacetone alcohol, into a reaction kettle for dilution, stirring for 10 minutes, adding tetrabutyl titanate, and stirring for 3 hours to obtain a colorless transparent solution, namely the high-water-retention organosilicon concrete external curing agent.
6. The preparation method of the high-water-retention type organosilicon concrete external curing agent according to claim 4, which is characterized in that the high-water-retention type organosilicon concrete external curing agent is prepared from the following raw materials in parts by weight: 100 parts of methyltrimethoxysilane, 50 parts of dimethyldimethoxysilane, 25 parts of gamma- (2, 3-epoxypropoxy) propyl trimethoxysilane, 8 parts of tetrabutyl titanate, 50 parts of a solvent which is a combination of 35 parts of methanol and 15 parts of diacetone alcohol, 25 parts of deionized water and 3 parts of a hydrolysis catalyst which is acetic acid;
the preparation method of the high water retention type organosilicon concrete external curing agent comprises the following process steps: (1) according to the mass ratio, methyl trimethoxy silane, dimethyl dimethoxy silane, gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, a hydrolysis catalyst and deionized water are put into a reaction kettle, mechanical stirring is started, the rotating speed is 180r/min, and hydrolysis reaction is carried out for 3 hours at normal temperature, so that a hydrolysis product is obtained; (2) then adding a solvent, namely methanol and diacetone alcohol, into a reaction kettle for dilution, stirring for 10 minutes, adding tetrabutyl titanate, and stirring for 3 hours to obtain a colorless transparent solution, namely the high-water-retention organosilicon concrete external curing agent.
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